Powertrain, generic · Hybrid propulsion

P0A4C Generator Position Sensor Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0A4C means the generator resolver delivers signals that are electrically present but implausible, so the computed rotor angle cannot be trusted. Mitsubishi documents the exact limits for the 2023 Outlander PHEV: the sine or cosine winding voltage must stay between 2.1 and 2.9 V; if either leaves that window for 0.28 s, or an internal status fault persists for 0.31 s, the generator control unit stores P0A4C. Typical triggers are a corroded or loose resolver plug, a chafed shield picking up noise, a winding that has drifted, or a faulty input stage in the power drive unit. P0A4B is the general circuit fault, P0A4D and P0A4E the hard low and high signal, P0A4F a sporadic dropout. Expect a hybrid warning, reduced power and possibly no engine start via the generator.

Likely causes

Corroded or loose resolver connector
Damaged shielding letting interference onto the sine/cosine lines
Resolver winding drifted out of tolerance
Faulty resolver input stage in the power drive unit

Symptoms

  • Hybrid system warning and MIL
  • Reduced drive power or engine-only operation
  • Engine start via the generator not possible

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–3,500
Time1–8 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

generator position sensorwiring harnesshybrid control module

Related codes

P0A4BP0A4DP0A4EP0A4FP0A50P0A40

References: mitsubishitechinfo.com, law.cornell.edu.